CVE-2020-11094: 
PHP vulnerability analysis and mitigation

The vulnerability CVE-2020-11094 is a critical security flaw discovered in the RainLab Debugbar plugin for October CMS. The issue was published on June 1, 2020, and affects versions prior to 3.1.0 of the rainlab/debugbar-plugin package. The vulnerability allows unauthorized access to stored request and session data when the plugin is misconfigured (GitHub Advisory).

The vulnerability stems from a feature in the debugbar that logs all requests and their associated information, including session data, when enabled. This logging functionality becomes a security risk when the plugin is enabled on systems accessible to untrusted users, as it could expose sensitive information from all requests made to the application (GitHub Advisory).

The vulnerability's impact is severe, potentially allowing non-authenticated public users to view all requests being made to the application and obtain sensitive information. More critically, it could lead to account takeovers of authenticated users, potentially resulting in full system access if specific conditions are met (GitHub Advisory).

The vulnerability was patched in version 3.1.0 of the plugin. The fix implements strict access controls, requiring authenticated backend users to have specific permissions before accessing the debugbar. Access to stored request information is now restricted behind a more restrictive permission. For users unable to upgrade to v3.1.0, manually applying commit 86dd29f is recommended as a workaround (GitHub Advisory).